[Bugs] #2504 UNSP: Scrollbars should include far right/bottom pixel column/row (Fitt's Law)

[Sugar Labs Bugs]

#2504: Scrollbars should include far right/bottom pixel column/row (Fitt's Law)
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    Reporter:  sethwoodworth              |          Owner:                                  
        Type:  enhancement                |         Status:  new                             
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team     
   Component:  sugar                      |        Version:  Unspecified                     
    Severity:  Unspecified                |       Keywords:  scollbar, scroll, fitt's law, UX
Status_field:  Unconfirmed                |   Distribution:  Unspecified                     
   Seeta_dev:                             |  
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 Scrollbars, by necessity for small screens, are small in sugar.  But we
 are not utilizing the right-most pixel as part of the scrollbar.  As cited
 in the Sugar HIG[0] states that screen corners and edges are control
 interfaces that are highly usable according to Fitt's Law[1].

 Here is the current interaction when someone wants to scroll down in an
 activity:
 1. User moves cursor to the far right scrollbar.
 2. User overshoots by one pixel to the right-most pixel (Y-max)
 3. User clicks and drags the cursor up or down.
 4. Sugar doesn't respond.

 Ideally, this would happen:
 1. User moves cursor to the far right scrollbar.
 2. User knows and expects the Y-max to be clickable as scrollbar
 3. User clicks and drags.
 4. Sugar scrolls the window.


 [0]
 http://wiki.sugarlabs.org/go/Human_Interface_Guidelines#Activation_Methods
 [1] http://en.wikipedia.org/wiki/Fitt%27s_law

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2504>
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